Safety drive means for transit concrete mixers



Jan. 31, 1928. 1,657,763

H. P. PARIS SAFETY DRIVE MEANS FOR TRANSIT CONCRETE MIXERS Filed Se t. 2. 192? 2 Sheets-Sheet l gww/ntoz Hugh P3 Paris E 3 WMHA Jan. 31, 1928.

H. P. PAT-11$ SAFETY DRIVE MEANS FOR TRANSIT CONCRETE MIXERS 2 Sheets-Sheet .2

Filed Sept. 2. 192'? gwuewtoz Hugh 7? Paris ""4 99: c an.

Patented a... 31, 1928.-

UNITED STATES PATENT OFFICE.

HUGH P. PARIS, KING COUNTY, NEAR KIRKLAND, WASHINGTON, ASSIGNOR TO PARIS TRANSIT MIXER CO., 01 SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON.

SAFETY DRIVE MEANS FOR TRANSIT CONCRETE MIXERS.

Application filed September 2, 1927. Serial No. 217,243.

My present invention relates to the transit concrete mixer shown in my co-pending applicationSerial No. 67,128, filed November th, 1925, this application being more 5 particularly directed to a safety means whereby the possibility of commencing to hoist the mixer for dumping prior to disengagement ofthe drive means therefor is eliminated.

It is, therefore, an object of my invention to provide means whereby operation of the hoist used in the dumping operation is prevented until the drive means to the mixer shell is disconnected.

My invention comprises the novel parts and the novel combinations thereof shown in the accompanying drawings, particularly described in this specification, and defined by the claims terminating the same.

In the drawings- Fig. 1 is a view in side elevation of one embodiment of my invention.

Fig. 2 is a view in horizontal section illustrating the vehicle frame With the power 2 drive to the mixer shell disconnected.

Fig. 3 is a view in detail side elevation partly in section of the control lever.

Fig. 4 is a view in side elevation of a modified form of construction.

'Fig. 5 is a view in detail plan of the power drive to the mixer shell and the shell hoist.

Fig. Bis a view in detail of the control means for the shell elevator and the safety device controlling its operation.

Fig. 7 is a view in detail of the shell drive take off associated with the main gear box.

In the accompanying drawings, I have shown my invention in two forms which il lustrate two alternative means of accomplishing the desired result.

In my co-pending application. referred to above, the mixer shell is rotated by means of a power-driven shaft which consists of two sections in alignment when the device is in position of rest, but when in dumping position having the two sections separated. It becomes necessary, therefore, to provide some means by which the hoisting operation is prevented until the two shaft sections referred to have been separated, in order to avoid the damage to these shafts and other parts which would occur if the hoisting operation were commenced prior to their separation. Inasmuch as the holst is controlled through an: arm mounted thereon,'I have.

proposed two alternative forms, one in which movement of the hoist arm is intercepted by a member movable with the clutch controlmeans, except as the clutch is disengaged, and the other a connection between the clutch control and the hoist control arm which will cause movement of the hoist control arm only when the dual control is properly manipulated.

The general features of the mixer and its drive are as shown in my application referred to and need only be briefly described. The mixer shell 1 is cradled in rollers 10 journaled in stanchions 11 which are supported in a sub-frame 12 pivoted at 13 upon the chassis 2. The sub-frame is tilted by means of a cable 30 connecting depending arms 14 on the sub-frame with the hoist plunger 31 of a vertical hydraulic hoist 3.. The Shell 1 is driven for mixing, either by a vane 15 passing over a large sprocket 16 on the shell and a small sprocket 17 ona shaft 18 journaled in the sub-frame, or by means of a spur gear 17 on the shaft 18, meshing with a large spur gear 16 on the shell.

It is also customary in such installations to provide a gear casing 4 controlled by a rod 40 to vary the speed ratio between the driving shaft 41 and the shaft 42 extending to the rear axle of the truck. For driving such elements as are mounted on the truck,

it is customary to provide a power take-off device contained within the casing 43 and having shafts 32 and 19 extending there from. As shown in Fig. 7 this power takeoff comprises a gear 44 mounted upon the shaft 19 which extends through the casing 43 and carrying jaw clutch members 45 and 45, which engage with complemental jaw clutch members 32' and 19, thereby, when shifted into engagement with one of these members 32' or 19, driving a hoist pump 33 or the shell 1. The gear-44 meshes continuously with a live gear 4 within the gear casing 4, and its movement is controlled through an external arm 46 and an internal arm47. Movement of the arm 46 is obtained through a rod 48 extending forward to a suitable control.

The shaft 19 is journaled in the chassis 2,

as at 21, to align with the shaft 19 when the.

sub-frame 12 is in position of rest. When in this position, a clutch member 5 on the shaft 19 may be shifted to engage with a complemental member 50 on the shaft 18. Shifting of the clutch member 5 is controlled through an arm 51 mounted on the chassis 2 and operable through a shifting rod 52 extending forward to a suitable control. Thus, with the clutch members 5 and 50 in engagement, the shell 1 is driven through the live gear 4, the gear 44, the clutch members 45 and 19', the shaft 19, the clutch members 5 and 50, shaft 18, and either the vane 15 or the gears 17, 16. To cease the rotation of the drum 1, the member 5 is disengaged from the complemental member 50.

The hoist is brought into operation by swinging a valve arm 34, which directs the fluid being circulated by the pump 33 in a manner to cause the plunger 31 to rise. This is well understood in the hoist art, and I have not deemed it necessary to illustrate it in detail here. Such movement of the arm 34 may be controlled through a handle 35 and rod 36, the handle being located in the upper .portion of the hoist so as to be conveniently reached by the driver or it may be controlled by means of a rod 37 extendin forward to a suitable control.

11 Figs. 1, 2 and 3, I have shown a means for controlling the operation of the clutch member 5 and the valve arm 34 in such a manner that the pump, which initiates movement of the hoist, may be controlled as desired, so long as the clutch member 5 is disengaged, an pJermitting re-engagement of the clutch mem er 5 only when the hoist has been lowered. Thus a control arm 6 is pivoted at and the rod 37 which controls the valve arm 34 is connected directly thereto at 63. The lower end of the lever 6 carries a pin 65, which is slidable in a slot 53 of a head 54, which forms the forward end of the rod 52, controlling movement of the clutch member 5. The forward end of the slot 53 terminates in a right angled slot 55, and when the pin is in registry with the right angled extension 55, it may be moved thereinto, and this movement is controlled by means of a link 62 connecting the head 54 with a bell crank lever 61.

Now, if it is desired-to engage the clutch member 5 with the member 50, the control lever 6 is pushed forward without moving the lever 61 mounted thereon. The pin 65 being in the offset 55, the head 54 will be moved rearwardly, and this movement will be communicated through the rod 52 to the clutch member 5 to move it rearwardly into engagement with the member 50. This movement also causes movement of the rod 37 connected to the valve arm 34 in a rearward direction, but this only serves to move the valve farther into the drum to lower the plunger 31. Now, if it is desired to hoist the mixer, it is necessary to pull rearwardly on the handle 6, and this can only result in pulling the rod 52 and the clutch member 5 forwardly. The first portion of this movement acting through the rod 37 will not cause-action of the hoist and only the lattermost portion thereof will bring the hoist into action. However, the clutch member 5 being disengaged from the member 50, if it is desired to lower the shell, this may be done by releasing the bell crank lever 61 to the action of the extension spring 66, whereupon the head 54 will be drawn upward to remove the vane 65 from the notch 55. The lever 6 can now be moved backward and forward without causing movement of the head 54, and the valve arm 34 can be manipulated as desired.

Referring now to Figs. 4, 5 and 6, it wil be seen that the rod 52 controlling movement of the clutch member 5, has secured thereto a plate 7, and that this rod passes close to the path of swing of the valve arm 34. The rod 52 is suitably guided as at 25 upon the chassis 2. Now, as the rod 52 is drawn forward by some suitable control, such as has heretofore been described, the plate 7 will clear the path of swing of the arm 35, as has been shown in Figs. 4 and 5. This movement disenga es the member 5 from the member 50, an only in this posit on is the valve arm 34 permitted to move in a direction to initiate operation of the hoist. Not until the valve arm 34 has been drawn upward, that is, in a direction to cause the pump to lower, can the plate 7 and its rod 52 be moved rearwardly. When in this rear position, the plate 7 intercepts movement of the valve arm 34 and, consequently, it is impossible to move the valve arm in such direction as to initiate operation of the hoist.

Thus I have shown two means in which the controls for the hoist and for the shell may be so connected that it is not possible to operate the hoist in such a manner as to damage the connections, that is to say, to cause hoisting of the mixer until the mixer drive means has been disconnected.

I claim:-

1. In a transit concrete mixer, the combination with the chassis of a truck and a power source mounted thereon, a sub-frame mounted upon said chassis and movable from a position of rest into dumping position, a power hoist for moving said sub-frame, a mixer element mounted upon said subframe. drive means operatively connecting said mixer element on the sub-frame with the power source on the chassis. actuati means operatively connecting the hoist Wltll' said power source, and control means for said hoist and said mixer drive means operable to render the hoist actuating means inoperable except as the mixer drive means is inoperable.

2. In a transit concrete mixer, the combination with a self-propelled vehicle, includ I ing chassis and power plant, of a mixer-g-element carried by said chassis and able from a position of rest into dumpiri gposition, a hoist operatively connected to the power plant for moving said mixer element, drive means including separable clutch elements, and operatively connecting said mixer element to the power plant, and control means permitting operation of the hoist only after separation of said clutch elements.

3. The combination with a mixer element movable bodily from a position of rest into dumping position, and adapted to be driven for mixing when in position of rest,- drive means for 'said mixer element, means for bodily moving said mixer element into dumping position, and control means for said mixer driving and moving means operable to prevent movement of the mixer while the said drive means are in operative engagement.

4. The combination with a mixer element movable bodily from a position of rest into dumping position, and adapted to be driven for mixing when in position of rest, drive means for said mixer element including power transmission members disengageable to permit bodily movement of the mixer into dumping position, means for bodily moving said mixer element into dumping position, and control means for said mixer driving and moving means operable to prevent movement of the mixer while said power transmission members are in engagement.

5. The combination with a mixer element movable bodily from a position of rest into dumping position, and ada ted to be driven for mixing when in position of rest, drive means for said mixer element including two aligned shafts and complemental clutch elements on the adjoinin ends of the respective shafts, and separa le axially to permit bodily movement of the mixer into dumping position, means for bodily moving sai mixer element into dumping position, and control mechanism for said mixer moving means and said clutch elements operable to prevent movement of the mixer prior to disengagement of the clutch elements.

6. The combination with a mixer element movable bodily from a position of rest into dumping position, and adapted to be driven for mixing when in position of rest, drive means for said mixer element including two aligned shafts and complemental clutch elements on the adjoining ends of the respective shafts, and separable axially to permit i v movement of the mixer into dumping position, a hoist for moving said mixer element into dumpin position, and control mechanism for sai hoist and said clutch elements including means to prevent operation of the hoist prior to disengagement of the clutch elements.

7. The combination with a mixer element movable bodily from a position of rest into dumping position, and adapted to be driven for mixing when in position of rest, drive meansxfor said mixer element, means for bodily moving said mixer element into dumping position, control means for said moving means including a movable arm, control means for said mixer drive means including a shiftable rod disposed adjacent the path of movement of said arm, and means carried by said rod and movable therewith, as the rod moves in the direction to energize said mixer drive means, into position to intercept movement of said arm in the direction to energize said moving means.

8. The combination with a self-propelled vehicle, including chassis andpower plant, of a mixer element carried on said chassis and bodily movable thereon from a position v of rest into dumping position, a. hoist, including a swinging control arm, for bodily moving said mixer, means for driving said hoist from said power plant, drive means operatively connecting said mixer element with said power plant, including a longitudinally shiftable rod disposed adjacent the path of swing of said hoist control arm, and a plate carried by said rod, and disposed in position to intercept movement of the arm in a direction to actuate the hoist, except as the mixer drive means is inoperative.

9. The combination with a self-propelled vehicle, including chassis and power plant, of a mixer element carried on said chassis and bodil movable thereon from a position of rest into dumping position, a hoist,-1neluding a swinging control arm, for bodily movin said mixer, means for driving said hoist rom said power plant, drive means,

including two aligned shafts and complemental clutch elements on the adjoining ends of the respective shafts for driving said mixer element from the power plant, said clutch elements being separable axially to permit hoisting of the mixer, a rod movable longitudinally and extendin between the drivers seat and the clutch e ements to control separation of the latter, said rod bein disposed adjacent the path of swing of sai hoist control arm, and a plate carried by said rod, and disposed thereon in position to intercept movement of the arm in a direc-.

tion to actuate the hoist, except as said clutch members are disengaged.

In testimony whereof I have slgned my name to this specification.

HUGHP. PARIS. 

